Lattice Dynamics of Laser Excited Ferroelectric BaTiO3
D. Issenmann, S. Schleef, S. Ibrahimkutty, G. Buth, T. Baumbach, A. Plech
Institute for Synchrotron Radiation, KIT, Postfach 3640, D-76021 Karlsruhe, Germany
M. Beyer and J. Demsar
Center for Applied Photonics, University of Konstanz, Universitätsstr. 10, D-78457 Konstanz, Germany
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We investigated the lattice dynamics of the prototypic ferroelectric barium titanate close to its ferroelectric-paraelectric phase transition aiming at a better understanding of the atomistic nature of the transition. The usage of time-resolved X-ray techniques allows to disentangle lattice motion and unit cell changes, which, in part, relate to the ferroelectric polarization. In the quasi-static case both the electrical and the laser excitation show a mean-field, simple thermal behaviour, while for time scales shorter than nanoseconds the impulsive nature of the excitation becomes visible.
DOI: 10.12693/APhysPolA.121.319
PACS numbers: 78.47.D-, 61.05.cp, 77.22.Ej, 65.40.De, 64.60.Cn